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process: fix reading zero-length env vars on win32 #18463

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process: fix reading zero-length env vars on win32 #18463

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addaleax
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Up until now, Node did not clear the current error code
attempting to read environment variables on Windows.
Since checking the error code is the way we distinguish between
missing and zero-length environment variables, this could lead to a
false positive when the error code was still tainted.

In the simplest case, accessing a missing variable and then a
zero-length one would lead Node to believe that both calls yielded
an error.

Before:

> process.env.I=''; process.env.Q; process.env.I
undefined
> process.env.I=''; /*process.env.Q;*/ process.env.I
''

After:

> process.env.I=''; process.env.Q; process.env.I
''
> process.env.I=''; /*process.env.Q;*/ process.env.I
''

This only affects Node 8 and above, since before
1aa595e we always constructed a
v8::String::Value instance for passing the lookup key to the OS,
which in in turn always made a heap allocation and therefore
reset the error code.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
Affected core subsystem(s)

process

@addaleax addaleax added windows Issues and PRs related to the Windows platform. process Issues and PRs related to the process subsystem. lts-watch-v8.x labels Jan 30, 2018
@nodejs-github-bot nodejs-github-bot added the c++ Issues and PRs that require attention from people who are familiar with C++. label Jan 30, 2018
@addaleax
process: fix reading zero-length env vars on win32
52d4e3b 
Up until now, Node did not clear the current error code
attempting to read environment variables on Windows.
Since checking the error code is the way we distinguish between
missing and zero-length environment variables, this could lead to a
false positive when the error code was still tainted.

In the simplest case, accessing a missing variable and then a
zero-length one would lead Node to believe that both calls yielded
an error.

Before:

    > process.env.I=''; process.env.Q; process.env.I
    undefined
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

After:

    > process.env.I=''; process.env.Q; process.env.I
    ''
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

This only affects Node 8 and above, since before
1aa595e we always constructed a
`v8::String::Value` instance for passing the lookup key to the OS,
which in in turn always made a heap allocation and therefore
reset the error code.
@addaleax addaleax force-pushed the windows-env-var-fix branch from 43801ea to 52d4e3b Compare January 30, 2018 19:32
bnoordhuis
bnoordhuis approved these changes Jan 30, 2018
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LGTM and appreciate the good commit log.

@addaleax addaleax mentioned this pull request Jan 30, 2018
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Fishrock123
Fishrock123 approved these changes Jan 30, 2018
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LGTM with CI: https://ci.nodejs.org/job/node-test-pull-request/12818/

indutny
indutny approved these changes Jan 30, 2018
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LGTM, 🤦‍♀️ 🤦‍♂️ (we had similar errors in node_crypto.cc)

addaleax added a commit to addaleax/webpack that referenced this pull request Jan 30, 2018
@addaleax
Work around Node environment variable bug
6193e8c 
Work around nodejs/node#18463 by
detecting the conditions under which the bug occurs and
performing a simple operation that resets the error state
if necessary.
addaleax added a commit to addaleax/webpack that referenced this pull request Jan 30, 2018
@addaleax
Work around Node environment variable bug
ba26e61 
Work around nodejs/node#18463 by
detecting the conditions under which the bug occurs and
performing a simple operation that resets the error state
if necessary.
addaleax added a commit to addaleax/webpack that referenced this pull request Jan 30, 2018
@addaleax
Work around Node environment variable bug
8da8b93 
Work around nodejs/node#18463 by
detecting the conditions under which the bug occurs and
performing a simple operation that resets the error state
if necessary.
@BridgeAR BridgeAR added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Feb 1, 2018
jasnell pushed a commit that referenced this pull request Feb 2, 2018
@addaleax @jasnell
process: fix reading zero-length env vars on win32
6acb1a3 
Up until now, Node did not clear the current error code
attempting to read environment variables on Windows.
Since checking the error code is the way we distinguish between
missing and zero-length environment variables, this could lead to a
false positive when the error code was still tainted.

In the simplest case, accessing a missing variable and then a
zero-length one would lead Node to believe that both calls yielded
an error.

Before:

    > process.env.I=''; process.env.Q; process.env.I
    undefined
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

After:

    > process.env.I=''; process.env.Q; process.env.I
    ''
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

This only affects Node 8 and above, since before
1aa595e we always constructed a
`v8::String::Value` instance for passing the lookup key to the OS,
which in in turn always made a heap allocation and therefore
reset the error code.

PR-URL: #18463
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Fedor Indutny <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
@jasnell
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jasnell commented Feb 2, 2018

Landed in 6acb1a3

@jasnell jasnell closed this Feb 2, 2018
@addaleax addaleax deleted the windows-env-var-fix branch February 2, 2018 18:56
@addaleax addaleax removed the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Feb 4, 2018
@richardlau richardlau mentioned this pull request Feb 12, 2018
Closed
@gibfahn
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gibfahn commented Feb 12, 2018 •
edited
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@nodejs/lts see #14593 (comment), I'm inclined to include the fix into 8.10.0 (it's not needed for 6.x).

Please weigh in.

@richardlau
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@nodejs/lts see #14593 (comment), I'm inclined to include the fix into 8.10.0 (it's not needed for 6.x).

Please weigh in.

SGTM in light of discussions in nodejs/Release#308

gibfahn pushed a commit that referenced this pull request Feb 18, 2018
@addaleax @gibfahn
process: fix reading zero-length env vars on win32
f99aba1 
Up until now, Node did not clear the current error code
attempting to read environment variables on Windows.
Since checking the error code is the way we distinguish between
missing and zero-length environment variables, this could lead to a
false positive when the error code was still tainted.

In the simplest case, accessing a missing variable and then a
zero-length one would lead Node to believe that both calls yielded
an error.

Before:

    > process.env.I=''; process.env.Q; process.env.I
    undefined
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

After:

    > process.env.I=''; process.env.Q; process.env.I
    ''
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

This only affects Node 8 and above, since before
1aa595e we always constructed a
`v8::String::Value` instance for passing the lookup key to the OS,
which in in turn always made a heap allocation and therefore
reset the error code.

PR-URL: #18463
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Fedor Indutny <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
@addaleax addaleax mentioned this pull request Feb 18, 2018
Closed
MylesBorins pushed a commit that referenced this pull request Feb 20, 2018
@addaleax @MylesBorins
process: fix reading zero-length env vars on win32
582fa6a 
Up until now, Node did not clear the current error code
attempting to read environment variables on Windows.
Since checking the error code is the way we distinguish between
missing and zero-length environment variables, this could lead to a
false positive when the error code was still tainted.

In the simplest case, accessing a missing variable and then a
zero-length one would lead Node to believe that both calls yielded
an error.

Before:

    > process.env.I=''; process.env.Q; process.env.I
    undefined
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

After:

    > process.env.I=''; process.env.Q; process.env.I
    ''
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

This only affects Node 8 and above, since before
1aa595e we always constructed a
`v8::String::Value` instance for passing the lookup key to the OS,
which in in turn always made a heap allocation and therefore
reset the error code.

PR-URL: #18463
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Fedor Indutny <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
MylesBorins pushed a commit that referenced this pull request Feb 21, 2018
@addaleax @MylesBorins
process: fix reading zero-length env vars on win32
0f2a522 
Up until now, Node did not clear the current error code
attempting to read environment variables on Windows.
Since checking the error code is the way we distinguish between
missing and zero-length environment variables, this could lead to a
false positive when the error code was still tainted.

In the simplest case, accessing a missing variable and then a
zero-length one would lead Node to believe that both calls yielded
an error.

Before:

    > process.env.I=''; process.env.Q; process.env.I
    undefined
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

After:

    > process.env.I=''; process.env.Q; process.env.I
    ''
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

This only affects Node 8 and above, since before
1aa595e we always constructed a
`v8::String::Value` instance for passing the lookup key to the OS,
which in in turn always made a heap allocation and therefore
reset the error code.

PR-URL: #18463
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Fedor Indutny <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
MylesBorins pushed a commit that referenced this pull request Feb 21, 2018
@addaleax @MylesBorins
process: fix reading zero-length env vars on win32
cec3d1e 
Up until now, Node did not clear the current error code
attempting to read environment variables on Windows.
Since checking the error code is the way we distinguish between
missing and zero-length environment variables, this could lead to a
false positive when the error code was still tainted.

In the simplest case, accessing a missing variable and then a
zero-length one would lead Node to believe that both calls yielded
an error.

Before:

    > process.env.I=''; process.env.Q; process.env.I
    undefined
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

After:

    > process.env.I=''; process.env.Q; process.env.I
    ''
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

This only affects Node 8 and above, since before
1aa595e we always constructed a
`v8::String::Value` instance for passing the lookup key to the OS,
which in in turn always made a heap allocation and therefore
reset the error code.

PR-URL: #18463
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Fedor Indutny <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
@MylesBorins MylesBorins mentioned this pull request Feb 21, 2018
Merged
@addaleax addaleax mentioned this pull request Feb 27, 2018
Closed
gibfahn added a commit that referenced this pull request Mar 6, 2018
@gibfahn
2018-03-06 Version 8.10.0 'Carbon' (LTS)
2fce636 
Notable changes:

* deps:
  * update V8 to 6.2.414.46 (Michaël Zasso) [#16413](#16413)
  * revert ABI breaking changes in V8 6.2 (Anna Henningsen) [#16413](#16413)
  * upgrade libuv to 1.19.1 (cjihrig) [#18260](#18260)
  * re land npm 5.6.0 (Myles Borins) [#18625](#18625)
  * ICU 60 bump (Steven R. Loomis) [#16876](#16876)
* crypto:
  * Support both OpenSSL 1.1.0 and 1.0.2 (David Benjamin) [#16130](#16130)
  * warn on invalid authentication tag length (Tobias Nießen) [#17566](#17566)
* async_hooks:
  * update defaultTriggerAsyncIdScope for perf (Anatoli Papirovski) [#18004](#18004)
  * use typed array stack as fast path (Anna Henningsen) [#17780](#17780)
  * use scope for defaultTriggerAsyncId (Andreas Madsen) [#17273](#17273)
  * separate missing from default context (Andreas Madsen) [#17273](#17273)
  * rename initTriggerId (Andreas Madsen) [#17273](#17273)
  * deprecate undocumented API (Andreas Madsen) [#16972](#16972)
  * add destroy event for gced AsyncResources (Sebastian Mayr) [#16998](#16998)
  * add trace events to async_hooks (Andreas Madsen) [#15538](#15538)
  * set HTTPParser trigger to socket (Andreas Madsen) [#18003](#18003)
  * add provider types for net server (Andreas Madsen) [#17157](#17157)
* n-api:
  * add helper for addons to get the event loop (Anna Henningsen) [#17109](#17109)
* cli:
  * add --stack-trace-limit to NODE_OPTIONS (Anna Henningsen) [#16495](#16495)
* console:
  * add support for console.debug (Benjamin Zaslavsky) [#17033](#17033)
* module:
  * add builtinModules (Jon Moss) [#16386](#16386)
  * replace default paths in require.resolve() (cjihrig) [#17113](#17113)
* src:
  * add helper for addons to get the event loop (Anna Henningsen) [#17109](#17109)
  * add process.ppid (cjihrig) [#16839](#16839)
* http:
  * support generic `Duplex` streams (Anna Henningsen) [#16267](#16267)
  * add rawPacket in err of `clientError` event (XadillaX) [#17672](#17672)
  * better support for IPv6 addresses (Mattias Holmlund) [#14772](#14772)
* net:
  * remove ADDRCONFIG DNS hint on Windows (Bartosz Sosnowski) [#17662](#17662)
* process:
  * fix reading zero-length env vars on win32 (Anna Henningsen) [#18463](#18463)
* tls:
  * unconsume stream on destroy (Anna Henningsen) [#17478](#17478)
* process:
  * improve unhandled rejection message (Madara Uchiha) [#17158](#17158)
* stream:
  * remove usage of *State.highWaterMark (Calvin Metcalf) [#12860](#12860)
* trace_events:
  * add executionAsyncId to init events (Andreas Madsen) [#17196](#17196)

PR-URL: #18336
gibfahn added a commit that referenced this pull request Mar 7, 2018
@gibfahn
2018-03-06 Version 8.10.0 'Carbon' (LTS)
fc9ddd9 
Notable changes:

* deps:
  * update V8 to 6.2.414.46 (Michaël Zasso) [#16413](#16413)
  * revert ABI breaking changes in V8 6.2 (Anna Henningsen) [#16413](#16413)
  * upgrade libuv to 1.19.1 (cjihrig) [#18260](#18260)
  * re land npm 5.6.0 (Myles Borins) [#18625](#18625)
  * ICU 60 bump (Steven R. Loomis) [#16876](#16876)
* crypto:
  * Support both OpenSSL 1.1.0 and 1.0.2 (David Benjamin) [#16130](#16130)
  * warn on invalid authentication tag length (Tobias Nießen) [#17566](#17566)
* async_hooks:
  * update defaultTriggerAsyncIdScope for perf (Anatoli Papirovski) [#18004](#18004)
  * use typed array stack as fast path (Anna Henningsen) [#17780](#17780)
  * use scope for defaultTriggerAsyncId (Andreas Madsen) [#17273](#17273)
  * separate missing from default context (Andreas Madsen) [#17273](#17273)
  * rename initTriggerId (Andreas Madsen) [#17273](#17273)
  * deprecate undocumented API (Andreas Madsen) [#16972](#16972)
  * add destroy event for gced AsyncResources (Sebastian Mayr) [#16998](#16998)
  * add trace events to async_hooks (Andreas Madsen) [#15538](#15538)
  * set HTTPParser trigger to socket (Andreas Madsen) [#18003](#18003)
  * add provider types for net server (Andreas Madsen) [#17157](#17157)
* n-api:
  * add helper for addons to get the event loop (Anna Henningsen) [#17109](#17109)
* cli:
  * add --stack-trace-limit to NODE_OPTIONS (Anna Henningsen) [#16495](#16495)
* console:
  * add support for console.debug (Benjamin Zaslavsky) [#17033](#17033)
* module:
  * add builtinModules (Jon Moss) [#16386](#16386)
  * replace default paths in require.resolve() (cjihrig) [#17113](#17113)
* src:
  * add helper for addons to get the event loop (Anna Henningsen) [#17109](#17109)
  * add process.ppid (cjihrig) [#16839](#16839)
* http:
  * support generic `Duplex` streams (Anna Henningsen) [#16267](#16267)
  * add rawPacket in err of `clientError` event (XadillaX) [#17672](#17672)
  * better support for IPv6 addresses (Mattias Holmlund) [#14772](#14772)
* net:
  * remove ADDRCONFIG DNS hint on Windows (Bartosz Sosnowski) [#17662](#17662)
* process:
  * fix reading zero-length env vars on win32 (Anna Henningsen) [#18463](#18463)
* tls:
  * unconsume stream on destroy (Anna Henningsen) [#17478](#17478)
* process:
  * improve unhandled rejection message (Madara Uchiha) [#17158](#17158)
* stream:
  * remove usage of *State.highWaterMark (Calvin Metcalf) [#12860](#12860)
* trace_events:
  * add executionAsyncId to init events (Andreas Madsen) [#17196](#17196)

PR-URL: #18336
@MylesBorins
Copy link
Contributor

Should this be backported to v6.x-staging? If yes please follow the guide and raise a backport PR, if not let me know or add the dont-land-on label.

@addaleax addaleax mentioned this pull request Mar 20, 2018
Closed
3 tasks
addaleax added a commit to addaleax/node that referenced this pull request Mar 21, 2018
@addaleax
process: fix reading zero-length env vars on win32
cec44be 
Up until now, Node did not clear the current error code
attempting to read environment variables on Windows.
Since checking the error code is the way we distinguish between
missing and zero-length environment variables, this could lead to a
false positive when the error code was still tainted.

In the simplest case, accessing a missing variable and then a
zero-length one would lead Node to believe that both calls yielded
an error.

Before:

    > process.env.I=''; process.env.Q; process.env.I
    undefined
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

After:

    > process.env.I=''; process.env.Q; process.env.I
    ''
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

This only affects Node 8 and above, since before
1aa595e we always constructed a
`v8::String::Value` instance for passing the lookup key to the OS,
which in in turn always made a heap allocation and therefore
reset the error code.

PR-URL: nodejs#18463
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Fedor Indutny <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
MylesBorins pushed a commit that referenced this pull request Mar 21, 2018
@addaleax @MylesBorins
process: fix reading zero-length env vars on win32
d94fedc 
Up until now, Node did not clear the current error code
attempting to read environment variables on Windows.
Since checking the error code is the way we distinguish between
missing and zero-length environment variables, this could lead to a
false positive when the error code was still tainted.

In the simplest case, accessing a missing variable and then a
zero-length one would lead Node to believe that both calls yielded
an error.

Before:

    > process.env.I=''; process.env.Q; process.env.I
    undefined
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

After:

    > process.env.I=''; process.env.Q; process.env.I
    ''
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

This only affects Node 8 and above, since before
1aa595e we always constructed a
`v8::String::Value` instance for passing the lookup key to the OS,
which in in turn always made a heap allocation and therefore
reset the error code.

Backport-PR-URL: #19484
PR-URL: #18463
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Fedor Indutny <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
MylesBorins pushed a commit that referenced this pull request Mar 28, 2018
@addaleax @MylesBorins
process: fix reading zero-length env vars on win32
0a4c79b 
Up until now, Node did not clear the current error code
attempting to read environment variables on Windows.
Since checking the error code is the way we distinguish between
missing and zero-length environment variables, this could lead to a
false positive when the error code was still tainted.

In the simplest case, accessing a missing variable and then a
zero-length one would lead Node to believe that both calls yielded
an error.

Before:

    > process.env.I=''; process.env.Q; process.env.I
    undefined
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

After:

    > process.env.I=''; process.env.Q; process.env.I
    ''
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

This only affects Node 8 and above, since before
1aa595e we always constructed a
`v8::String::Value` instance for passing the lookup key to the OS,
which in in turn always made a heap allocation and therefore
reset the error code.

Backport-PR-URL: #19484
PR-URL: #18463
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Fedor Indutny <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
MylesBorins pushed a commit that referenced this pull request Mar 30, 2018
@addaleax @MylesBorins
process: fix reading zero-length env vars on win32
988cca8 
Up until now, Node did not clear the current error code
attempting to read environment variables on Windows.
Since checking the error code is the way we distinguish between
missing and zero-length environment variables, this could lead to a
false positive when the error code was still tainted.

In the simplest case, accessing a missing variable and then a
zero-length one would lead Node to believe that both calls yielded
an error.

Before:

    > process.env.I=''; process.env.Q; process.env.I
    undefined
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

After:

    > process.env.I=''; process.env.Q; process.env.I
    ''
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

This only affects Node 8 and above, since before
1aa595e we always constructed a
`v8::String::Value` instance for passing the lookup key to the OS,
which in in turn always made a heap allocation and therefore
reset the error code.

Backport-PR-URL: #19484
PR-URL: #18463
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Fedor Indutny <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
@MylesBorins MylesBorins mentioned this pull request Apr 13, 2018
Merged
MayaLekova pushed a commit to MayaLekova/node that referenced this pull request May 8, 2018
@addaleax @MayaLekova
process: fix reading zero-length env vars on win32
b8f94e2 
Up until now, Node did not clear the current error code
attempting to read environment variables on Windows.
Since checking the error code is the way we distinguish between
missing and zero-length environment variables, this could lead to a
false positive when the error code was still tainted.

In the simplest case, accessing a missing variable and then a
zero-length one would lead Node to believe that both calls yielded
an error.

Before:

    > process.env.I=''; process.env.Q; process.env.I
    undefined
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

After:

    > process.env.I=''; process.env.Q; process.env.I
    ''
    > process.env.I=''; /*process.env.Q;*/ process.env.I
    ''

This only affects Node 8 and above, since before
1aa595e we always constructed a
`v8::String::Value` instance for passing the lookup key to the OS,
which in in turn always made a heap allocation and therefore
reset the error code.

PR-URL: nodejs#18463
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Fedor Indutny <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
MayaLekova pushed a commit to MayaLekova/node that referenced this pull request May 8, 2018
@gibfahn @MayaLekova
2018-03-06 Version 8.10.0 'Carbon' (LTS)
185ac06 
Notable changes:

* deps:
  * update V8 to 6.2.414.46 (Michaël Zasso) [nodejs#16413](nodejs#16413)
  * revert ABI breaking changes in V8 6.2 (Anna Henningsen) [nodejs#16413](nodejs#16413)
  * upgrade libuv to 1.19.1 (cjihrig) [nodejs#18260](nodejs#18260)
  * re land npm 5.6.0 (Myles Borins) [nodejs#18625](nodejs#18625)
  * ICU 60 bump (Steven R. Loomis) [nodejs#16876](nodejs#16876)
* crypto:
  * Support both OpenSSL 1.1.0 and 1.0.2 (David Benjamin) [nodejs#16130](nodejs#16130)
  * warn on invalid authentication tag length (Tobias Nießen) [nodejs#17566](nodejs#17566)
* async_hooks:
  * update defaultTriggerAsyncIdScope for perf (Anatoli Papirovski) [nodejs#18004](nodejs#18004)
  * use typed array stack as fast path (Anna Henningsen) [nodejs#17780](nodejs#17780)
  * use scope for defaultTriggerAsyncId (Andreas Madsen) [nodejs#17273](nodejs#17273)
  * separate missing from default context (Andreas Madsen) [nodejs#17273](nodejs#17273)
  * rename initTriggerId (Andreas Madsen) [nodejs#17273](nodejs#17273)
  * deprecate undocumented API (Andreas Madsen) [nodejs#16972](nodejs#16972)
  * add destroy event for gced AsyncResources (Sebastian Mayr) [nodejs#16998](nodejs#16998)
  * add trace events to async_hooks (Andreas Madsen) [nodejs#15538](nodejs#15538)
  * set HTTPParser trigger to socket (Andreas Madsen) [nodejs#18003](nodejs#18003)
  * add provider types for net server (Andreas Madsen) [nodejs#17157](nodejs#17157)
* n-api:
  * add helper for addons to get the event loop (Anna Henningsen) [nodejs#17109](nodejs#17109)
* cli:
  * add --stack-trace-limit to NODE_OPTIONS (Anna Henningsen) [nodejs#16495](nodejs#16495)
* console:
  * add support for console.debug (Benjamin Zaslavsky) [nodejs#17033](nodejs#17033)
* module:
  * add builtinModules (Jon Moss) [nodejs#16386](nodejs#16386)
  * replace default paths in require.resolve() (cjihrig) [nodejs#17113](nodejs#17113)
* src:
  * add helper for addons to get the event loop (Anna Henningsen) [nodejs#17109](nodejs#17109)
  * add process.ppid (cjihrig) [nodejs#16839](nodejs#16839)
* http:
  * support generic `Duplex` streams (Anna Henningsen) [nodejs#16267](nodejs#16267)
  * add rawPacket in err of `clientError` event (XadillaX) [nodejs#17672](nodejs#17672)
  * better support for IPv6 addresses (Mattias Holmlund) [nodejs#14772](nodejs#14772)
* net:
  * remove ADDRCONFIG DNS hint on Windows (Bartosz Sosnowski) [nodejs#17662](nodejs#17662)
* process:
  * fix reading zero-length env vars on win32 (Anna Henningsen) [nodejs#18463](nodejs#18463)
* tls:
  * unconsume stream on destroy (Anna Henningsen) [nodejs#17478](nodejs#17478)
* process:
  * improve unhandled rejection message (Madara Uchiha) [nodejs#17158](nodejs#17158)
* stream:
  * remove usage of *State.highWaterMark (Calvin Metcalf) [nodejs#12860](nodejs#12860)
* trace_events:
  * add executionAsyncId to init events (Andreas Madsen) [nodejs#17196](nodejs#17196)

PR-URL: nodejs#18336
@addaleax addaleax mentioned this pull request Jun 18, 2018
Closed
@alexeykuzmin alexeykuzmin mentioned this pull request Jun 19, 2018
Closed
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@BridgeAR BridgeAR BridgeAR approved these changes

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@cjihrig cjihrig cjihrig approved these changes

@targos targos targos approved these changes

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@Fishrock123 Fishrock123 Fishrock123 approved these changes

@thefourtheye thefourtheye thefourtheye approved these changes

@jasnell jasnell jasnell approved these changes

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@indutny indutny indutny approved these changes

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